ATI Radeon X800 XT Platinum Edition

Nvidia GeForce 6800 killer?

Review There's always been pretty heavy rivalry between ATI and Nvidia, but this time around it seems a lot more tangible. With both companies launching completely new parts at roughly the same time, it's understandable that there was a lot of pressure going around in both camps, writes Riyad Emeran.

By the time ATI was getting into the swing of things, Nvidia had officially launched the GeForce 6800, and speculation over which chip would be the fastest began to rise to fever pitch.

Early rumours about the R420 - the codename for the X800 - expected the high-end part to launch with 12 pixel pipelines, while pre-launch rumours about the NV40 - the codename for the GeForce 6800 - hinted that the high-end part would have 16 pixel pipelines. When the GeForce 6800 Ultra actually appeared it did in fact boast 16 pipelines, making the expected 12 pixel pipeline high-end part from ATI seem a little shaky. However, when ATI announced the Radeon X800 XT, it did turn out to be a 16-pixel pipeline part, putting it on level ground with the GeForce 6800 Ultra.

But the similarity between the ATI and Nvidia specs didn't end there, because ATI also announced that the Radeon X800 Pro would be a 12 pixel pipeline solution, just like the Nvidia GeForce 6800 part.

Let's cover the basics first. The X800 range of cards won't all be launching at the same time. So, today sees the launch of the X800 Pro, while if you want an X800 XT Platinum Edition, you're going to have to wait until 21 May.

As well as the 12 Pixel pipelines, the X800 Pro also sports six vertex pipelines, 256MB of GDDR 3 memory running at 900MHz, a 256-bit memory interface and a core VPU speed of 475MHz.

The X800 XT Platinum Edition on the other hand backs up its 16 pixel pipelines with six vertex pipelines, 256MB of GDDR 3 memory running at 1.12GHz, a 256-bit memory interface and a 520MHz core VPU speed.

As far as price goes, ATI has announced an SRP of $399 for the Pro and $499 for the XT part. Going out on a limb, I'd imagine that this will equate to British pricing of £299 and £399 respectively, although this is pure speculation.

Looking at the clock speeds on both the cards, you can see that ATI has really pushed the boat out, especially with the XT flavour. But amazingly, despite the higher clock speeds, ATI has managed to keep the power consumption to a minimum. Even the X800 XT card draws less power than the Radeon 9800XT.

The impressive low power consumption is achieved by the implementation of low-k dielectric technology. The low-k technology was first introduced on the Radeon 9600XT last year which showed off its low power consumption by not needing any external power. The problem with chip manufacture is that as the die process shrinks, the chances of interference and cross-talk between circuits becomes more likely. The traditional method of overcoming this interference is to push more power through the circuits, which will ensure efficient transistor switching. Unfortunately, more power also means more heat and you're left with a cooling issue too. But low-k dielectrics improve the insulation between the circuits, thus allowing efficient transistor switching without the need for excessive power, and consequently without the extra heat.

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